What is an easy way to make caps in Fallout?

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You can search for pre-war books en sell them in the Arlington Library for 100 caps each. You can also finish the Reilly's Rangers quest and, upon completion, she will offer you a geomapping module to carry around with you. Keep the module in your inventory and when you get messages saying you discovered a new location, go back and visit Reilly and she will give you decent money. You can visit several locations and then go see her, you don't have to visit her after every location discovered.